GetDefaultValueConstantName

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

( excerpt from php.net/manual/en/reflectionparameter.getdefaultvalueconstantname.php )

public function getDefaultValueConstantName();

Returns the default value's constant name if default value is constant or null

Returns

• mixed - Returns string on success or NULL on failure.